I finally finished installing the door mechanisms, so now is the time to bond the door halves together. First task was to sand, using 60 grit sandpaper, the areas of the halves where the doors mate. I then masked the Cabin Top and Fuselage, where excess epoxy might squish out the edges, with clear packing tape. There are two areas inside the door that need a structural filler called ParaBeam, the cranial cavity and the elbow cavity. ParaBeam is a 3D fiberglass woven “sandwich” fabric. The latch pocket area doesn't use the ParaBeam filler. I cut the ParaBeam in 5" x 9" sections and then prepared the resin. It was a warm day so I knew I needed to work quickly. To start, I "painted" resin on the contact areas of the outer shell. Then I "wetted out" the ParaBeam in a paint roller tray and applied it to the areas on the inner door shell. Next, I prepared some Cab-O-Sil for the flange areas on the inner door half. Once clecoed together I was able to mount the door in the door frame with clecos, clamps and Gorilla Tape. One door down! Ran out of resin... Door 2 another day.